Film and plate developing hanger



Aug. 7, 1951 K. E. PENNEY FILM AND PLATE DEVELOPING HANGER Filed July 30, 1946 OOOOOGOOOOOQOOOOOOOOQ In yen/Z02" Patented Aug. 7, 1951 2,562,942 FILM AND PLATE DEVELOPING HANGER Kenneth E. Penney, White Bear Lake, Minn., as-

signor to Minnesota Mining & Manufacturing Company, St. Paul, Minn., a corporation of Delaware Application July 30, 1946, Serial No. 687,173

3 Claims.

was necessary to remove the film from the holder I or hanger in order to accomplish this.

One objective therefore is to provide means for quick inversion without removal of the film from the holder.

Briefly, the present invention provides means for rotatably mounting a film-retaining frame within or upon a separate supporting means. More specifically, the invention provides a device comprising two frames, one a supporting frame and the other a film-holding or retaining frame which is pivotally mounted within the supporting frame, with means for holding the supporting frame by suspension from the upper edges of a tank, so that the film-retaining frame is immersed in the bath of treating fluid. Inversion of the film may then be accomplished simply by turning the film-retaining frame 180 on its horizontal axis within the stationary supporting frame, without removal of the film from the device; in fact the inversion may even be accomplished without removal of the device from the bath, if desired.

The invention is exemplified by a device described hereinafter and illustrated in the accompanying drawings in which:

Figures 1 and 2 are rear and side elevational views, respectively;

Figure 3 is a sectional view taken on the line 3-3 in Figure 1; and

Figure 4 is a fragmentary front elevational view of an alternative form.

A film-retaining frame It] is constructed of three perforated channel members I I and a fourth perforated channel member l2 which latter is hinged at 13 so that it may open and permit the insertion and withdrawal of a photographic plate or film, in a manner well known to the art, as exemplified by the device shown in the said Viken Patent No. 1,583,708. Theopen sides or edges of the channel members I l and I2 face inwardly, and together they form a continuous groove that ex- 2 tends clear around the inner edge of the frame 10 into which the film fits and by means of which it is held or retained.

A supporting frame 20 is constructed of a crossbar or supporting bar 2| having slots 22 at either endadapted to fit upon the upper edges of a tank when the bar rests thereon during the immersion of a film. A side member in the form of a strap 23 is fixed to the bar 21 near one end thereof and extends downwardly therefrom. A second side member 24 is similarly attached toward the other end of the bar. The two are spaced apart sufficiently to permit the film-retaining frame to swing freely when mounted between them.

Means for rotatably mounting the film-retaining frame I0 within the supporting frame 20 is provided in the form of pins 25 fixed to either side of the frame In to form journals that extend outwardly through complementary holes 26 in the side members 23 and 24 on which the journals 25 bear.

To hold the two frames l0 and 20 releasably fixed in relation to each other during treatment of a film, there may be provided one or more pro jections on the one, positioned to fit into complementary recesses in the other. The projections may be on the film-retaining frame ID with the recesses in the supporting frame 20, or, as shown herein, they may be on the supporting frame 20 with the recesses in the film-retaining frame ID. The recesses may be indentations, or, as shown herein, they may be holes that pierce the member.

' Two forms of locking device are shown. In the first, shown in Figures 1 and 2, a leaf spring 30 is fixed by rivets 3| to the side member 24 so that it bears thereagainst, and at its free end a projection in the form of a pin 32 is fixed to the spring so that it extends inwardly toward the film-retaining frame I 0. Holes 0r apertures 33 and 34 through the side member 24 and the adjacent channel member II, respectively, are positioned opposite the pin 32, of a size and shape to permit passage of the pin therethrough. If desired, a second similar locking device 30 may be provided on the other side in addition to the first.

In operation, the upper or pin-holding end of the leaf spring 30 is drawn or bent away from the side member 24 by the finger or thumb nail of the operator, thus withdrawing the pin 32 from the aperture 34. While it is held in this position the film-retaining frame 10 is rotated about a horizontal axis on the bearings 26 in the manner indicated by the dotted line drawings of the frame ID in Figure 3. The recess or hole 34 will In a second form of locking device shown in Figure e,.no leaf spring is usedbut the side I member I23 itself serves as a spring, being flexible in relation to the film-retaining frame. A

projection in the form of a pin I32 is fixed to the inner face of the side member I23 so as v to project into the complementary recess 01' aperture le in the channel member III, thereby holding or looking the two frames III! and I20.

releasably or temporarily fixed in relation to eachother. 'To release them the strap or fiat flexible side member I23 is drawn, sprung or bowed outwardly to the right, thereby withdrawing the pin I32 from the hole I34 and rendering the r film-retaining frame free to turn. If desired, the locking device may be provided on both sides ef the frame. I

I claim:

1. An apparatus for inverting photographic film during the fiuid treatment of the film comprising a rectangular film-retaining frame, means for retaining afiat photographic film in the frame, a hanger comprising a normally horizontalsupporting bar, a strap extending downwardly from and fixed to the bar, and a second strap fixed to the bar and spaced from the first strap adistance greater than the width of'th'e frame, both straps being longer than half of the height of the frame, and means for pivotally mountingthe frame in a normally vertical position between the straps for rotation about a horizontal axis that passes through both sides of the frame midway between the top and bottom ofthe frame and through both straps, the distance between the axis andthe supporting bar being greater than half of the height of the frame, to permit inversion of the frame within the hanger by 180 of rotation of the frame about the said axis, the frame being supported by the straps.- I

2. An apparatus for inverting photographic film during the fluid treatment of the film'com prising a normally vertical rectangular film-retaining frame, means for retaining a fiat photographic film in the frame, a frame-supporting hanger comprising a normally horizontal supporting bar, a strap extending vertically downwardly from and fixed to the bar, and a second 4; strap fixed to the bar parallel to and spaced from the first strap a distance greater than the width of the frame, both straps being longer than half of the height of the frame, means for pivotally mounting the frame between the straps for rotation about a horizontal axis that passes through. both sides of thejrame midway between the top? and bottom of the fraine and through both straps, the distance between the axis and the supporting bar being greater than half of the height of the frame, to permit inversion of the frame within the hanger by of rotation of the frame about the said axis, and means for releasably holding the frame fixed in -a vertical position.

3. An apparatus for inverting photographic filmduring fiuid treatment of the film comprising a normally vertical film-retaining frame having sides and a top and bottom, means for retaining a fiat photographic film in the frame, a frame-supporting. hanger comprising a normally horizontal supporting bar, a strap extending downwardly from and fixed to the bar, and a second strap fixed to the bar, and spaced from the first strap a distance, greater, than the width of the framegboth straps beinglonger than half the height .of the frame, means for pivotally mounting the frame between the strapsffor rotation about a horizontal axis that passes through both sides of'the frame midway between the top and bottom of the frame and through both straps, the. distance between the axis and the supporting bar being greater than half of the height of the frame, to permit inversion of the frame within the hanger by 180 of rotation of the frame about the said axis, and means for releasably holding the frame fixed in a vertical position.

KENNETH E. PENNEY;

REFERENCES CITED .The following references are of record in the file of this patent:

UNITED STATES PATENTS 7 161,582" Switzerland July 17, 1933 

